Imprint of Gravitational Lensing by Population III Stars in Gamma-Ray Burst Light Curves

  title={Imprint of Gravitational Lensing by Population III Stars in Gamma-Ray Burst Light Curves},
  author={Yasuo Hirose and Masayuki Umemura and Atsunori Yonehara and Jun'ichi Sato},
  journal={The Astrophysical Journal},
We propose a novel method of extracting the imprint of gravitational lensing by Population III stars in the light curves of gamma-ray bursts (GRBs). Significant portions of GRBs can originate in hypernovae of Population III stars and be gravitationally lensed by foreground Population III stars or their remnants. If the lens mass is on the order of 102-103 M☉ and the lens redshift is greater than 10, the time delay between two lensed images of a GRB is ≈1 s and the image separation is ≈10 μas… 
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